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NYC-WTC_000208411

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NYC 9/11 Public Portal Document I□!2125534062 PAGE 4/15 may-30-02 16:21 FROM:MOODYS INVESTORS SVR

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These conditions as observed do not necessarily pose a health risk to occupants of the building as long as the HVAC systems are not operated. When the system is turned ori however, these contaminants would be blown out into the apartments.

The one concern that should be further investigated at this time is the presence of mercury tn the sample results. Mercury is a heavy metal which is liquid at room temperature, and can form vapors. These vapors If inhaled can lead to serious neurological problems. To evaluate this risk air samples should be collected both inside the duct work, and in side the apartment area.

Based on alt these results, it is not advisable to start up the HVAC system. Each system should be professionally deaned, starting with the entire marine room, air intakes, and return plenum, and then working outward down the supply ducts. All sections of flex duct should be removed, and replaced with new materials.

CITY_2IMCl0 0_0 0 0914561

NYC-WTC_000208412

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NYC-WTC_000208412Source: NYC Law Department, mirrored locally

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